<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>留言板</title>
    <style>
        .container {
            width: 350px;
            height: 300px;
            margin: 0 auto;
            /* border: 1px black solid; */
            text-align: center;
        }

        .grey {
            color: grey;
        }

        .container .row {
            width: 350px;
            height: 40px;

            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .container .row input {
            width: 260px;
            height: 30px;
        }

        #submit {
            width: 350px;
            height: 40px;
            background-color: orange;
            color: white;
            border: none;
            margin: 10px;
            border-radius: 5px;
            font-size: 20px;
        }
    </style>
</head>

<body>
    <div class="container">
        <h1>留言板</h1>
        <p class="grey">输入后点击提交, 会将信息显示下方空白处</p>
        <div class="row">
            <span>谁:</span> <input type="text" name="" id="from">
        </div>
        <div class="row">
            <span>对谁:</span> <input type="text" name="" id="to">
        </div>
        <div class="row">
            <span>说什么:</span> <input type="text" name="" id="say">
        </div>
        <input type="button" value="提交" id="submit" onclick="submit()">
        <!-- <div>A 对 B 说: hello</div> -->
    </div>

    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.4/jquery.min.js"></script>
    <script>
        $.ajax({
            method: "get",
            url: "/message/getList",
            success: (list) => {
                if (list !== null && list.length > 0) {
                    let finalHTML = ""
                    for (let x of list) {
                        finalHTML += "<div>" + x.from + "对" + x.to + "说:" + x.message + "</div>";
                    }
                    $(".container").append(finalHTML)
                }
            }
        })

        function submit(){
            //1. 获取留言的内容
            const from = $("#from").val();
            const to = $("#to").val();
            const say = $("#say").val();
            if (from === '' || to === '' || say === '') {
                return;
            }
            let data = JSON.stringify({
                from: from,
                to: to,
                message: say
            })
            $.ajax({
                method: "post",
                url: "/message/publish",
                contentType: "application/json",
                data: data,
                success: (res) => {
                    res = JSON.parse(res)
                    if (res.ok === 1) {
                        //2. 构造节点
                        const divE = "<div>" + from + "对" + to + "说:" + say + "</div>";
                        //3. 把节点添加到页面上
                        $(".container").append(divE)
                    } else {
                        alert("出大问题！！！")
                    }
                }
            })
            //4. 清空输入框的值
            $("#from").val("")
            $("#to").val("")
            $("#say").val("")
        }
        
    </script>
</body>

</html>